V.S. Kumov1, A.V. Samorodov2
1,2 Bauman Moscow State Technical University (Moscow, Russia)
Phenotypic features of the face and head are extremely important for geneticists, since a number of syndromes are characterized by certain distinctive features of the craniofacial morphology. The description of the patient's phenotype during the clinical examination is often subjective. Attempts are being made to automate the recognition of hereditary diseases from a face image, but the problem of constructing the best feature space for such system has not been solved. Thus, this work is devoted to study various feature spaces for automated recognition of hereditary diseases from a face image. The algorithm for recognition of hereditary diseases was trained and tested using different combinations of features: coordinates of control points, deep features, distances and indices and their z-scores. When using anthropometric features that characterize the structure of the face and their z-scores, it is possible to build a classifier that provides more than 90 % classification accuracy for 8 and 9 classes at rank r = 3. The selection of the features using a greedy algorithm, do not lead to an increase in classification accuracy, therefore, it is advisable to use the full set of 32 distances or their z-scores. Classification accuracy is higher when using distances and indices than when using their z-scores, which is due to errors in automatic age determination. A study of the dependence of the probabilities of correct, erroneous, and indeterminate recognitions on the decision threshold showed that at a zero error rate (at a threshold equal to 0.5) for rank r = 2, the probability of correct recognitions and refusal to make a decision are 80 % and 20 %, respectively, at taking into account the values of the indices, which indicates the possibility of reducing the error and the risk of incorrect recognition while maintaining high probability of correct recognition. The highest classification accuracy values were obtained using combined features, including both geometric and deep features.
Kumov V.S., Samorodov A.V. Investigation of the feature space for building a system for automated recognition of hereditary diseases from a face image. Biomedicine Radioengineering. 2022. V. 25. № 5. Р. 49-57. DOI: https://doi.org/10.18127/j15604136-202205-06 (In Russian)
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